DBA_COL_PRIVS

All grants on columns in the database

Columns
   ___________________________
 
   GRANTEE
      Name of the user to whom access was granted
   OWNER
      Username of the owner of the object
   TABLE_NAME
      Name of the object
   COLUMN_NAME
      Name of the column
   GRANTOR
      Name of the user who performed the grant
   PRIVILEGE
      Column Privilege
   GRANTABLE
      Privilege is grantable